Warren quadrangle, Pennsylvania-New York : 15 minute series (topographic)

Chicago citation style
Geological Survey (U.S.). Warren quadrangle, Pennsylvania-New York : 15 minute series (topographic). 1943. Retrieved from the Digital Public Library of America, http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/693. (Accessed December 19, 2018.)
APA citation style
Geological Survey (U.S.), (1943) Warren quadrangle, Pennsylvania-New York : 15 minute series (topographic). Retrieved from the Digital Public Library of America, http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/693
MLA citation style
Geological Survey (U.S.). Retrieved from the Digital Public Library of America <http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/693>.
Note: These citations are programmatically generated and may be incomplete.